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Note 7 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended
	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Expense		$ 168,000	$ 215,000
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense		$ 146,000	$ 206,000
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 406,780
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 146 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		73 days
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount		$ 28,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)
Performance Stock Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense	$ 17,000
Performance Stock Units [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	500,000